Improvement in deadening noise on elevated railroads



G E BENDIX Deadening Noise on Elevated Railroads.

Patented Dec. 2, 1.879.

wi Kiwi UNITED "STATES PATENT OFFICE.

GEORGE E. BENDIX, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN DEADENiiNG NO ISE ON ELEVATED RAILROADS.

Specification forming part of Letters Patent No. 222,230, dated December 2, 1879 application filed March 24, 1879.

To all whom it may concern:

Be it known that I, GEORGE E. BENDIX, of the city of Brooklyn, in the county of- Kings and State of New York, have invented a new and useful Improvement in Sound-Arrestin g or Noise Deadening Devices for Elevated "Bailways, of which the following is a specification.

The invention relates to sound-arresters or noise-deadeners for elevated railways.

H eretofore other devices that have been tried for this purpose have been found to be objec tionable for the following reasons: first, that withdraw from the rail; third, thatthe space between the base of the rail and the guardrails has been obstructe'd,'leaving no opening for the free passage of snow, ice, and dirt,

which must necessarily accumulate, thereby rendering the road inoperative; fourth, that I no provision has been made'for the ready and Q inexpensive removaland. replacement of ma;

' terials used when repairs to the roadare found necessary.

The object of my invention is to provide a practical device for arresting or deadening the sound or noise on elevated railways, which will overcome all objections experienced in other tried devices. i

t The invention consists in the, arrangement t of the sound-arresting tubes, whereby sound or noise is transmitted and arrested or dead ened withinthe tubes. a

It also consists in holding the same automaticallyin their positions; and it finally consists in the particularconstruction and arrange ment of the tubes and mechanism, whereby they are held automatically in their positions.

In the accompanying drawingsQin' which similar letters of reference indicate like parts,

Figure l, is a perspective of a device embody ing my invention. Fig. 2 is a sectional end elevation of the same.- Fig. 3 is another end elevation with'a modified spring for holding the sound-arresting tubes against the rail and having said tubes removed from one side of the rail. Fig. 4 is a longitudinal view of. the metallic portion of the tube used on that side of the rail wherejthe flanges of the wheels operate, as seen from the line mm, Fig. 2,looking toward the spiral spring. Fig. 5 is a longitudinal view of a portion of the same, showin g the position of spiral spring and bolt, looking toward the line as m. Fig. 6 is a longitudinal view of a portion of the material forming a tube on the opposite side or outer side of the rail, and showing the position of the keeper, rubber spring, and bolt, looking toward the linear w; and Fig. 7 is alongitudinal view of a portion of the same, showing the perforations formed by placing thetedges of the material together, as seen fromtheline or .1.

Within the recess of the rail A, on that side of the rail on which the flanges of the wheels operate, is placed a strip of perforated nonsound-conducting material, B, (sheet-rubber being preferred,) which shall be a little'wider than is required to cover the recessof the rail. The metallic portion 0 is then placed against the strip of perforated rubber B, the two forming'the tube 0 within the recess of therail.

The springs F, which are sustainedfby the bolts G, (said bolts passing through the guardrail H,) or by staples I, driven into the ties J,

hold the tubes automatically against that side of the rail. On the opposite side of the rail,

or that side on which no flanges operate, the

- device, which may be much larger, consists of perforated rubber hose, or of a strip of nonsound-conductin g material, L,-having p'ortions cut out of its edges N, which, when folded together to form the tube 0, also form the perforations M. This strip or tube 0 is placed with its butting edges N and perforations M against the rail A,within therecess, the springs F, sustained by the bolts G, (said bolts passin g through the guard-rail H,) or by the staples I, driven into the ties J, holding the keeper-K against the tube 0 and securin g thejwhole' automatically against the rail A.

If desired, the interior of thetubesmay be filled with a non-conductor of sound, D.

The operation of the device is as follows: When sound ,or noise is created bythe vibration of the air caused by the concussion of the wheel and the rail, it is transmitted from the 2. The combination, with a rail, of one or more tubes and springs for holding the same against the rail, asset forth.

3. In combination with the rail, the tubes 0 O, the keeper K, and the springs F, supported by the bolts G or staples L substa-utially as described.

GEORGE E. BENDIX.

Witnesses J. SMITH RICHARDS, W. H. IOTTEBAUM. 

